IRCT20221124056590N1 IRCT 2022-12-17 Rajaie Cardiovascular Medical and Research Center The effect of pursed lip breathing on arterial blood oxygen saturation The effect of pursed lip breathing on arterial blood oxygen saturation in patients with COVID-19 2023-01-21 anticipated 70 Complete https://irct.ir/trial/67278 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Randomization description: First, a convenient sampling method will be used. The samples will then be placed in quadruple blocks by random block randomization. Random allocation software is also used as a randomization tool. Non-transparent envelopes will be used and will be sealed with random sequences (Sequentially numbered, sealed, opaque envelopes). They are placed in order. In order to maintain the random sequence, numbering is done on the outer surface of the envelopes in the same way. Finally, the lids of the envelopes are glued and placed inside a box, respectively. At the beginning of the registration of participants, based on the order of entry of eligible participants in the study, one of the envelopes will be opened in order and the assigned group of the participants will be revealed. 2 COVID-19. Intervention 1: Intervention group: in this group, in addition to the usual treatments and care, the patients were taught face-to-face method, the lip bud breathing technique 2 times a day with an interval of 5 minutes and 10 times each time on the second, third and fourth days of hospitalization. Intervention 2: Control group: Control group: This group receives only the usual treatments and care. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no further information